add missing namespaces/fix wrong class-names

src/Module/Credits.php

@@ -4,6 +4,7 @@ namespace Friendica\Module;
 
 use Friendica\BaseModule;
 use Friendica\Core\Renderer;
+use Friendica\DI;
 
 /**
  * Show a credits page for all the developers who helped with the project

src/Module/Debug/Babel.php

@@ -5,6 +5,7 @@ namespace Friendica\Module\Debug;
 use Friendica\BaseModule;
 use Friendica\Content\Text;
 use Friendica\Core\Renderer;
+use Friendica\DI;
 use Friendica\Model\Item;
 use Friendica\Util\XML;
 

src/Module/Search/Acl.php

@@ -9,6 +9,7 @@ use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
 use Friendica\Core\Search;
 use Friendica\Database\DBA;
+use Friendica\DI;
 use Friendica\Model\Contact;
 use Friendica\Model\Item;
 use Friendica\Network\HTTPException;

src/Module/Settings/UserExport.php

@@ -209,7 +209,7 @@ class UserExport extends BaseSettingsModule
 	 * echoes account data and items as separated json, one per line
 	 *
 	 * @param App $a
-	 * @throws Exception
+	 * @throws \Exception
 	 */
 	private static function exportAll(App $a)
 	{